Modified J1....J4 method for linear readout of dynamic phase changes in a fiber optic interferometer

Wei Jin; Li-Ming Zhang; Deepak G. Uttamchandani; Brian Culshaw

doi:10.1117/12.20300

1 August 1990 Modified J1....J4 method for linear readout of dynamic phase changes in a fiber optic interferometer

Wei Jin, Li-Ming Zhang, Deepak G. Uttamchandani, Brian Culshaw

Proceedings Volume 1267, Fiber Optic Sensors IV; (1990) https://doi.org/10.1117/12.20300
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

Fibre optic interferometers have been extensively studied for sensing applications because of the very high sensitivities with which many physical parameters can be measured using these devices. A limiting feature of fibre interferometers is the random phase changes which occur at the interferometer output because of general environmental fluctuations, for example, due to changes of ambient temperature. These fluctuations can be compensated by active phase tracking techniques which keep the interferometer biased at quadrature. Passive demodulation techniques are of greater practical interest and the J1....J4 technique has been recently proposed as a method for the linear measurement of dynamic phase changes in a fibre interferometer. In this technique the interferometer requires no phase bias. The measurement is unaffected by random phase fluctuations in the interferometer. However, the J1....J4 technique is limited by the fact that only the magnitude of the J1....J4 Bessel components can be measured on a spectrum analyser so that no information about the sign of the Bessel function is available thereby generating some ambiguity in the readout. In this paper, a modified technique which overcomes this limitation is demonstrated.

Citation Download Citation

Wei Jin, Li-Ming Zhang, Deepak G. Uttamchandani, and Brian Culshaw "Modified J1....J4 method for linear readout of dynamic phase changes in a fiber optic interferometer", Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); https://doi.org/10.1117/12.20300

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available